1. Alexander Bell taught in a school for deaf.
-> Alexander Bell taught in a school for the deaf.
2. When he heard the words, Watson rushed upstairs, run into Bell's room, and shouted, ''I heard you!''
-> When he heard the words, Watson rushed upstairs, ran into Bell's room, and shouted, ''I heard you!''
3. He is going to buying a new computer.
-> He is going to buy a new computer.
Vì: sau to là verb nguyên mẫu nhé, ko phải verb ing
Chúc bạn học tốt! #@.@